cheby1

Hi, I'm having problems finding something out something simple.

If I'm given this: -

[b,a] = cheby1(8,1,0.4); 
y = filter(b,a,x);

then what do the three digits in the brackets after 'cheby1' mean?

Also what does b, a and x mean?

Many thanks,

Tom

[Matt Fig]

Hi, I'm having problems finding something out something simple.

If I'm given this: -

[b,a] = cheby1(8,1,0.4); y = filter(b,a,x);

then what do the three digits in the brackets after 'cheby1' mean?

Also what does b, a and x mean?

Many thanks,

Tom

[Matt Fig]

Tom's question

Hi, I'm having problems finding something out something simple.

If I'm given this: -

[b,a] = cheby1(8,1,0.4); y = filter(b,a,x);

then what do the three digits in the brackets after 'cheby1' mean?

Also what does b, a and x mean?

Many thanks,

Tom

Answer 1

[Kevin Holst]

Chebyshev Type 1 filter design

http://www.mathworks.com/help/toolbox/signal/ref/cheby1.html

1-D digital filter

http://www.mathworks.com/help/techdoc/ref/filter.html

Answer 2

[Honglei Chen]

This is clearly explained in documentation.

doc cheby1

http://www.mathworks.com/help/toolbox/signal/ref/cheby1.html

x is the input signal, also see the doc

doc filter